Fitting clothes to character model with python
Well, i don't know what modifiers you mean, but a common way is to create the Basic shape of the cloth around the Body.
After that's done you add a subsurface and a shrinkwrap mod. Now switch to edit-mode and play around with the modell untill most parts of the cloth fit to the Surface of the character. Now you add a solidify mod. Now you should have a simple cloth-part fitting onto your mesh.
For more a more detailed explanation check this out:


  https://www.youtube.com/watch?v=ljMePAmmxx4


Hope I can help you...